This aphorism is about real faith – knowing through contact through every center. Conscious faith is three lower centers unified, and both higher centers active, all knowing through direct experience that something is so. One is not tied to any outcome other than what is. Freedom. Emotional faith is based on the hope, wish or desire of the emotional center, and the emotional parts of the moving/Instinctive and intellectual centers, that something is so, with an opposite of fear that it is not so. It makes the object of desire, and fear, possess us, thus making us slaves to it. Mechanical faith is simply learned and automatically repeated habits of the mechanical parts of centers – no sense in it at all.